This is going to be short. Therefore I did not make it a full blown tutorial.
If you are looking for a site to upload your PowerPoint Presentations and Photo Albums, authorSTREAM will fit the bill. It is very simple to sign up and off you go uploading. Most times it is very fast, but a few times they must have been very busy and it took longer. There are a few things to remember.
1. If you have sound/music, it must be put into the PP slideshow with the "Animations" facility (not as "Insert"). And that requires a .wav file. Anything else will not show upstream.
2. Once your PP show is uploaded, you can have it convertd to an .mp4 movie which you can download.
3. The quality for both the on-line PP show and the movie conversion is very good.
That's all there is to know. I have uploaded these two that you can check out regarding quality. (a few other uploads I have deleted because of the sound problem that I did not fathom at first).